75441554821 has 2 divisors, whose sum is σ = 75441554822. Its totient is φ = 75441554820.

The previous prime is 75441554819. The next prime is 75441554873. The reversal of 75441554821 is 12845514457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72754272900 + 2687281921 = 269730^2 + 51839^2 .

It is a cyclic number.

It is not a de Polignac number, because 75441554821 - 2¹ = 75441554819 is a prime.

Together with 75441554819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75441554921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37720777410 + 37720777411.

It is an arithmetic number, because the mean of its divisors is an integer number (37720777411).

Almost surely, 2^75441554821 is an apocalyptic number.

It is an amenable number.

75441554821 is a deficient number, since it is larger than the sum of its proper divisors (1).

75441554821 is an equidigital number, since it uses as much as digits as its factorization.

75441554821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896000, while the sum is 46.

The spelling of 75441554821 in words is "seventy-five billion, four hundred forty-one million, five hundred fifty-four thousand, eight hundred twenty-one".